I bought a used 2008 Jay Feather 30' TT this year and love it.
It came with an old style hitch that requires a sway bar to be removed when I back up the trailer. The dealer told me that I would need to consider getting a "K2" hitch as soon as possible, and quoted $599. Installed.
Is it worth it, in your opinion, to get rid of the sway bar? Does performance improve at all on the highway?

After doing some additional research, I have to re-state my question:
I see that the E2 weight distribution=bars, not the hitch, is my real question.
I have the old sway bar, and want to know if the newer style distribution system is better? Is it worth the money when it comes to performance?

I can't really speak for the E2, which is the economy version of the Equal-i-zer hitch (made by the same company, Fastway), but the Equal-i-zer, which uses friction on the bars for sway control, works great (definitely much better than a standard hitch with the friction bar). It is tried and tested for several years, with mostly great reviews (myself included).

Just a word of advice, if you get a new hitch, install it yourself. If you read and follow instructions well, you will do a much better job than the RV shop will. Adventure RV has it for under $470 shipped. Adventure RV Equal-i-zer 1200

If your unable to install the hitch yourself and feel that you need it, the price is a dealer price for an installed hitch from a dealer. Your paying them to work, it takes time to install and setup. It's not hard. It just takes time. If you feel it is too much contact a hitch shop and see what they would charge.

Equalizer hitches are nice products. Just remember that they REDUCE sway, they do not ELIMINATE it.

If this is your first rig, your going to feel trucks pass you regardless of what hitch you have. Your driving a large trailer with a lot of surface area for the wind to push on.
If it's not your first you have to compare the handling to whatever your past experience is and make sure your comfortable, if your not you will need to spend money on a new hitch and take the time to adjust it.

No matter what hitch you purchase, the only way to properly set it up is for the rig to be weighed and the hitch adjusted to get your front axle weight as close as you can back to what it was unloaded on your TV. That is a variable that can change based on how you load your coach, how you load your truck and whatever other things you have changed each time you go camping. Your dealer is probably not going to fine tune the hitch, rather they are going to go to some basic settings that will work for most setups.